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Balance Sheet Components - Schedule of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 31,621 $ 28,421
Less: Accumulated depreciation (16,866) (13,972)
Property and equipment, net 14,755 14,449
Manufacturing equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 19,113 11,307
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 5,374 4,752
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 2,386 8,925
Computer software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 2,040 1,299
Computer equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,505 1,351
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,203 $ 787